US4372334A - Overpressure relief control system - Google Patents
Overpressure relief control system Download PDFInfo
- Publication number
- US4372334A US4372334A US06/303,346 US30334681A US4372334A US 4372334 A US4372334 A US 4372334A US 30334681 A US30334681 A US 30334681A US 4372334 A US4372334 A US 4372334A
- Authority
- US
- United States
- Prior art keywords
- relief
- pressure
- valve
- passage
- overpressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
- F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/0318—Processes
- Y10T137/0324—With control of flow by a condition or characteristic of a fluid
- Y10T137/0379—By fluid pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/1624—Destructible or deformable element controlled
- Y10T137/1632—Destructible element
- Y10T137/1684—With alarm or indicator
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/1624—Destructible or deformable element controlled
- Y10T137/1632—Destructible element
- Y10T137/1692—Rupture disc
- Y10T137/1714—Direct pressure causes disc to burst
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2496—Self-proportioning or correlating systems
- Y10T137/2559—Self-controlled branched flow systems
- Y10T137/265—Plural outflows
- Y10T137/2663—Pressure responsive
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8158—With indicator, register, recorder, alarm or inspection means
- Y10T137/8326—Fluid pressure responsive indicator, recorder or alarm
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86509—Sequentially progressive opening or closing of plural ports
- Y10T137/86517—With subsequent closing of first port
- Y10T137/86533—Rotary
- Y10T137/86541—Plug
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/877—With flow control means for branched passages
- Y10T137/87788—With valve or movable deflector at junction
- Y10T137/8782—Rotary valve or deflector
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/87917—Flow path with serial valves and/or closures
Definitions
- the present invention relates to control systems for valves and, more particularly, a control system for a valve in a multiple passage overpressure relief system.
- overpressure relief systems are the requirement of almost every pressurized line, tank, or other vessel.
- the most common types of relief devices are rupture discs and relief valves. Rupture discs present an inherent problem in that once ruptured, the disc must be replaced in order for the relief device to seal the vent line associated therewith. If the material in the line or tank is toxic or otherwise hazardous, the line or tank must often be completely emptied and purged before the ruptured disc may be replaced. In addition, if the material in the line or tank is volatile in nature, a substantial amount of the material may escape into the vent system before the ruptured disc can be replaced.
- Relief valves overcome the problem associated with ruptured discs somewhat in that valves are biased to close and thereby occlude the vent line after the pressure in the system returns to an acceptable level.
- relief valves are relatively expensive compared to rupture discs.
- relief valves require a great deal of maintenance in order to insure their workability and, therefore, must frequently be removed from the process and tested. Such removal again requires that volatile or hazardous materials be removed from the process tanks and lines protected by the relief valves before the valve can be removed. It is, therefore, desirable that multiple relief devices be provided for a common vent such that the vent may normally be in flow communication with the first relief device and, should the first device need maintenance and/or replacement, be able to switch to a second relief device while isolating the first device from the system.
- valve In switching from one relief device to another, it is extremely important to insure that the process under pressure is at all times protected by at least one of the relief devices. After the first disc has ruptured, it is desirable for the valve to communicate the pressurized fluid in the line or tank to the unruptured relief device as soon as the pressure within the process returns to a non-overpressure state and stabilizes. In this manner, the loss of material from the process through the ruptured relief device beyond that which is necessary to return the process to a non-overpressure state is minimized.
- valve in a multiple relief device system with an automated control system which is responsive to the rupture of a first disc to automatically actuate the valve to communicate the process with an unruptured relief device.
- the control mechanism can be manually overridden or may operate to partially swing the valve to the unruptured relief device so as to continue to vent some of the material and thereby relieve the overpressure condition but not vent more material than is necessary to reduce the pressure to an acceptable level.
- the principal objects of the present invention are: to provide a system for controlling a valve providing communication between a pressurized line and a pair of relief passages having overpressure relief devices therein; to provide such a system which includes the monitoring of the pressure in the pressurized line, the status of the relief devices, and the position of the valve for determining whether to switch the valve; to provide such a system, the functions of which are monitored and controlled by a computer; to provide such a system wherein the valve is normally placed to provide flow communication with a first relief passage having a rupture disc blocking flow therethrough; to provide such a system which switches the system to a second relief passage upon the rupture of the disc in the first relief passage; to provide such a system which allows excess pressure to exhaust before switching to the second relief passage to avoid rupturing a second disc therein; to provide such a system which is adaptable for throttling communication with the first relief passage such that after the first disc has ruptured and the valve has switched to the second relief passage, if the pressure rises to the overpressure level, the valve switches
- FIG. 1 is a block diagram of a preferred embodiment of the control system according to the present invention.
- FIG. 2 is an elevational view of a valve assembly with which the control system of the present invention is used.
- FIG. 3 is an enlarged diagramatic plan view of a first position of a flow directing member of the valve with which the control system is used with a valve housing shown in phantom.
- FIG. 4 is a view similar to FIG. 3 and illustrates a second position of the flow directing member.
- FIG. 5 is a block diagram of a modification of the control system according to the present invention.
- FIG. 6 is a view similar to FIG. 3 and shows the flow directing member in a position to vary communication between the pressure passage and the relief passages of the valve assembly of FIG. 2.
- the reference numeral 1 generally designates a control system for controlling the operation of a valve assembly 2 providing communication between a pressure vessel 3 and a pair of relief vents 4 and 5.
- the relief vents 4 and 5 have respective overpressure relief devices 8 and 9 positioned therein to block flow therethrough until the pressure within the assembly 2 exceeds the overpressure rating of the relief devices 8 and 9.
- the valve assembly 2 includes a flow directing member or valve 11 rotatable by a motor or actuator 12 to align ports 14 and 15 of the valve with relief passages 17 and 18 respectively of the relief vents 4 and 5.
- at least one of the overpressure relief devices, for example device 8 is a rupture disc.
- the control system 1 includes a programmable controller or computer 20 which is responsive to selected parameters of the valve assembly 2 so as to place the flow directing member 11 in a position to provide communication between a pressure passage 21 of the valve assembly 2 and one of the relief passages 17 or 18.
- valve assembly with which the control system 1 is particularly suitable is disclosed in my copending application for U.S. Patent entitled VALVE ASSEMBLY, Serial No. 264,355, filed May 18, 1981, and which is incorporated herein by reference.
- the valve assembly 2 includes a housing 24 having the valve member 11 positioned therein and having the pressure passage 21 and relief passage 17 and 18 interconnected therein.
- the valve member 11 is positioned such that a spherical surface 25 thereof sealingly engages a surface within the housing 24 to prevent flow through the relief passages 17 and 18 except when one of the ports 14 or 15 opens thereinto.
- the valve member 11 is connected by a stem or shaft 26 to the actuator 12 for rotation of the valve member 11 to change the position thereof.
- the actuator 12 may be an electric, hydraulic, pneumatic, or similar motor.
- the relief device 8 is preferably a rupture disc.
- the relief device 9 may be any type of overpressure relief device such as an overpressure relief valve, a rupture disc or a vent to a surge tank.
- each of the relief devices 8 and 9 is a rupture disc. Any type of conventional rupture disc arrangement may be employed for the rupture discs 8 and 9.
- each of the rupture discs 8 and 9 is embodied as a replaceable rupture disc cartridge arrangement.
- U.S. Patent entitled REPLACEABLE RUPTURE DISC CARTRIDGE ARRANGEMENT Ser. No. 264,276, filed May 18, 1981.
- the actuator 12, which controls the position of the valve member 11, is in turn controlled by the programmable controller 20 which monitors selected conditions or parameters of the valve assembly 2.
- the conditions which are monitored by the programmable controller or computer 20 include the pressure within the pressure passage 21, the position of the valve member 11, and the status of the overpressure relief devices 8 and 9.
- the position of the valve member 11 is sensed by means of a first limit switch 30 and a second limit switch 31 which are positioned for actuation by means such as a tripping tab 32 on the stem 26 of the valve member 11.
- the first limit switch 30 is positioned for actuation when the valve member 11 is placed in a first position (see FIG.
- the second limit switch 31 is positioned for actuation when the valve member 11 is placed in a second position (see FIG. 4) wherein the port 15 provides full flow communication between the pressure passage 21 and the second relief passage 18.
- the pressure in the pressure passage 21 may be monitored by means of a pressure transducer 33 positioned therein.
- the pressure transducer 33 may be positioned to monitor the pressure in the pressure vessel 3. In a static situation, such as where there is no flow through the pressure passage 21, the pressure in the pressure vessel 3, pressure passage 21, or within the valve assembly 2 are all substantially equal. Under dynamic conditions, when there is flow through the valve assembly, the pressure acting on one of the relief devices 8 or 9 is different from the pressure within the pressure passage 21 or pressure vessel 3 by an amount which may be measured and taken into consideration.
- the status of the rupture discs 8 and 9 may be monitored by means of burst disc indicators respectively 35 and 36.
- the burst disc indicators 35 and 36 may be any type of conventional arrangements for determining whether a rupture disc has ruptured.
- the majority of known burst disc indicators are of the contact type wherein portions of the ruptured disc cause contact between conductive portions of the indicator upon bursting.
- a different type of conductive burst indicator is disclosed in a pending application for U.S. Patent entitled RUPTURE DISC ALARM SYSTEM, Ser. No. 115,261, filed Jan. 25, 1980 and assigned to the same assignee of the present application..
- a burst disc indicator which functions by capacitive principles is disclosed in a pending application for U.S.
- Patent entitled CAPACITIVE PRESSURE RELIEF RUPTURE DISC MONITOR Ser. No. 230,662, filed Feb. 2, 1981 and assigned to the same assignee as the present invention.
- the status of the relief valve may be monitored by means of a pneumatic or electrical signaling device incorporated into the relief valve or by means of a pressure transducer or switch installed downstream of the relief valve within the second relief vent 5.
- the programmable controller 20 may be any type of digital computer having the capacity for processing all of the monitored parameters and control and display functions in real-time.
- the limit switches 30 and 31 and burst disc indicators 35 and 36 are digital measurements.
- the functions of the pressure transducer 33 and, in some cases, the actuator 12 are analog in nature. Therefore, the controller 20 would have to include analog-to-digital and digital-to-analog converters to interface the analog inputs and outputs thereto.
- Computers considered for use in the control system 1 include a model Apple II computer from Apple Computers, Inc. in conjunction with a model No. MHP-X023 A/D and D/A converter from Mountain Computer, Inc. of Santa Cruz, California or a model No. EPC7101 Programmable Sequencer from Encoder Products Company.
- the computer 20 is provided with the usual terminal features including a keyboard (not shown) and a display unit 38 for providing a visual indication of the position of the valve member 11, the pressure within the pressure passage 21, and the status of each of the relief devices 8 and 9, such as a cathode ray tube (CRT) display.
- a keyboard not shown
- a display unit 38 for providing a visual indication of the position of the valve member 11, the pressure within the pressure passage 21, and the status of each of the relief devices 8 and 9, such as a cathode ray tube (CRT) display.
- CTR cathode ray tube
- the computer 20 would have a plurality of the valve assemblies, such as assembly 2, interfaced therewith for control thereby.
- the limits to the number of valve assemblies 2 which could be controlled by a single computer 20 would depend upon the capacity of the particular computer 20 to process the data from the systems connected thereto in real-time. If more valve assemblies 2 were desired to be controlled from a single control point, a plurality of the computers 20 having the valve assemblies 2 connected thereto could be interfaced with a master computer (not shown).
- the overpressure rating of the overpressure relief devices 8 and 9 is entered into the computer 20.
- the valve 11 is normally placed in a first position (as in FIG. 3) wherein the port 14 provides full flow communication between the pressure passage 21 and the first relief passage 17 having the rupture disc 8 therein.
- the first position of the valve 11 is sensed by the first limit switch 30.
- the disc 8 fails thereby exhausting excess pressure through the relief passage 17.
- the rupture of the disc 8 is sensed by the first burst disc indicator 35 positioned on the disc 8 or in the vent 4 which provides a signal to the computer 20 which responds by activating the alarm 39.
- the computer 20 monitors the pressure within the passage 21 by means of the pressure transducer 33 positioned therein.
- the computer 20 controls the actuator 12 to rotate the valve 11 to the second position (see FIG. 4) wherein the port 15 provides flow communication between the pressure passage 21 and the second relief passage 18 having the disc 9 therein.
- a timer (not shown) within the computer 20 is initiated.
- the selected first fraction of the overpressure rating of the disc 9 to which the computer allows the pressure to exhaust is, in the preferred embodiment, eighty percent of the pressure required to rupture the disc 9.
- the computer 20 continues through the timer to monitor the pressure for a selected time interval in order to allow the pressure within the system to stabilize. If the pressure increases to a selected second fraction of the overpressure rating of the disc 9 within the selected time interval, the computer 20 controls the actuator 12 to return the valve 11 to the first position in order to exhaust the excess pressure through the previously ruptured disc 8.
- the selected second fraction of the overpressure rating of the disc 9 is, for example, ninety percent.
- the valve 11 remains in the first position until the pressure within the passage 21 again decreases to the first fraction, or eighty percent of the second disc overpressure rating, at which time the valve 11 is returned to the second position. In this manner, the second disc 9 is prevented from being ruptured; and, further, the loss of fluid through the opening relief passage 17 is minimized.
- the pressure vessel 3 may then be returned to normal operation with overpressure protection provided by the second disc 9.
- the ruptured disc 8 may be removed and replaced so that the pressure vessel 3 is again provided with a primary and a backup overpressure protection device.
- the valve 11 may be manually locked in the second position by a switch or the like adapted to disengage power from the actuator 12.
- FIG. 5 illustrates a modified embodiment according to the present invention.
- the modified control system 45 includes a programmable controller or computer 46 having first and second burst disc indicators respectively 47 and 48 and a pressure passage transducer 49 connected as inputs thereto.
- the computer 46 has an alarm 50 connected thereto and a CRT display 51 for displaying information relating to the control of the valve assembly 2.
- These functions of the control system 45 are substantially similar to corresponding functions associated with the preferred control system 1.
- the principal difference between the preferred control system 1 and the modified system 45 is that the computer 46 is operative to continuously monitor the position of the valve 11 by means of a position sensor 52, in contrast to the limit switches 30 and 31 of the system 1.
- the position sensor 52 may comprise any type of device for continuously monitoring the position of the valve 11.
- One type of continuous position sensor 52 which may be associated with the actuator 12 provides a pneumatic signal wherein the pressure thereof is an indication of the position of the valve 11.
- Other types of sensors 52 which may be employed include hydraulic or electrical sensing and signaling devices.
- One type of electrical position sensor which may be employed includes an encoding wheel (not shown) wherein a plurality of apertures on a periphery thereof are operative to establish and interupt a light beam directed to a photocell.
- a digital counter within the computer 46 is then employed to determine the position of the valve 11. In some cases, particularly with a counting type of electrical position sensor, it is sometimes desirable to employ a stepping motor as the actuator 12.
- the operation of the modified system 45 is somewhat different from the operation of the preferred control system 1.
- the computer 46 allows the pressure to exhaust to, for example, eighty percent of the overpressure rating of the second relief device 9 before controlling the actuator 12 to rotate the valve 11 to the second position.
- the computer 46 controls the actuator 12 to rotate the valve 11 to partially align the port 14 with the first relief passage 17.
- the valve 11 is throttled to maintain the pressure within the pressure passage 21 below, for example, ninety percent of the overpressure rating of the second relief device 9.
- the valve 11 When the pressure within the passage 21 has decreased, for example, below eighty percent of the overpressure rating of the second relief device 9 and stabilized, the valve 11 is rotated into the second position so that the first rupture disc may be replaced.
- the modified control system 46 is substantially similar to the preferred control system 1.
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Abstract
Description
Claims (14)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/303,346 US4372334A (en) | 1981-05-18 | 1981-09-18 | Overpressure relief control system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/264,355 US4403626A (en) | 1981-05-18 | 1981-05-18 | Valve assembly |
US06/303,346 US4372334A (en) | 1981-05-18 | 1981-09-18 | Overpressure relief control system |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/264,276 Continuation-In-Part US4444214A (en) | 1981-05-18 | 1981-05-18 | Replaceable rupture disc cartridge arrangement |
US06/264,355 Continuation-In-Part US4403626A (en) | 1981-05-18 | 1981-05-18 | Valve assembly |
Publications (1)
Publication Number | Publication Date |
---|---|
US4372334A true US4372334A (en) | 1983-02-08 |
Family
ID=26950489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/303,346 Expired - Lifetime US4372334A (en) | 1981-05-18 | 1981-09-18 | Overpressure relief control system |
Country Status (1)
Country | Link |
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US (1) | US4372334A (en) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4546787A (en) * | 1981-06-22 | 1985-10-15 | Clark Rubber Limited | Hydraulic valve control device |
US4580599A (en) * | 1985-07-25 | 1986-04-08 | The Dow Chemical Company | Valve assembly for relieving pressure on a process structure |
US4617970A (en) * | 1985-04-11 | 1986-10-21 | Institute Po Mebeli I Obzavejdane | Fluidic sensor of objects |
US4777383A (en) * | 1987-06-01 | 1988-10-11 | Ldi Pneutronics Corp. | Electrically controlled variable pressure pneumatic circuit |
WO1990012974A1 (en) * | 1989-04-19 | 1990-11-01 | Ajit Singh Gill | Compact multi-stage pressure reducing valve |
US4978947A (en) * | 1989-05-25 | 1990-12-18 | Bs&B Safety Systems, Inc. | Rupturable fluid flow indicator |
US5060691A (en) * | 1989-04-19 | 1991-10-29 | Gill Ajit S | Compact multi-stage pressure reducing valve |
WO1991016562A1 (en) * | 1990-04-19 | 1991-10-31 | Ajit Singh Gill | Compact multi-stage pressure reducing valve |
US5583490A (en) * | 1994-07-15 | 1996-12-10 | Htv Industries, Inc. | Rupture disk monitoring apparatus |
US5774372A (en) * | 1996-03-29 | 1998-06-30 | Berwanger; Pat | Pressure protection manager system & apparatus |
WO1999056047A3 (en) * | 1998-04-24 | 2000-02-10 | Anderson Greenwood Lp | Pressure relief valve monitoring device |
US6371162B1 (en) * | 2000-04-20 | 2002-04-16 | Fisher Controls International, Inc. | Electric actuator for fluid control valves |
US20050198973A1 (en) * | 2004-03-11 | 2005-09-15 | General Electric Company | Magnet vent assembly apparatus |
WO2008070643A2 (en) * | 2006-12-06 | 2008-06-12 | Chevron U.S.A. Inc. | Overpressure protection device |
US20090000406A1 (en) * | 2001-08-24 | 2009-01-01 | Bs&B Safety Systems Limited | Controlled safety pressure response system |
US20100308241A1 (en) * | 2006-03-03 | 2010-12-09 | Kevin Doyle | Electronically controlled valve actuator in a pool or spa water line system |
US20120319857A1 (en) * | 2009-07-31 | 2012-12-20 | Geof Brazier | Pressure relief device integrity sensor |
US20140251472A1 (en) * | 2013-03-06 | 2014-09-11 | J-Mac Tool, Inc. | Overpressurization Bypass for Fluid Valve |
US20150114478A1 (en) * | 2013-10-28 | 2015-04-30 | Pierre-François Jérôme Tavard | Bursting Relief valve |
US20150122948A1 (en) * | 2013-02-28 | 2015-05-07 | Airbus Operations Limited | Aircraft fuel tank arrangement |
US10228069B2 (en) | 2015-11-06 | 2019-03-12 | Oklahoma Safety Equipment Company, Inc. | Rupture disc device and method of assembly thereof |
CN112943989A (en) * | 2021-03-18 | 2021-06-11 | 国网河南省电力公司南阳供电公司 | Dustproof cap, SF6 circuit breaker |
US11143322B2 (en) | 2019-05-06 | 2021-10-12 | Celeros Flow Technology, Llc | Systems and methods for providing surge relief |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3952759A (en) * | 1974-08-14 | 1976-04-27 | M & J Valve Company | Liquid line break control system and method |
US4215746A (en) * | 1979-06-28 | 1980-08-05 | W-K-M Wellhead Systems, Inc. | Pressure responsive safety system for fluid lines |
US4263929A (en) * | 1979-01-08 | 1981-04-28 | Kearney John G | Electropneumatic pressure relief indicator |
-
1981
- 1981-09-18 US US06/303,346 patent/US4372334A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3952759A (en) * | 1974-08-14 | 1976-04-27 | M & J Valve Company | Liquid line break control system and method |
US4263929A (en) * | 1979-01-08 | 1981-04-28 | Kearney John G | Electropneumatic pressure relief indicator |
US4215746A (en) * | 1979-06-28 | 1980-08-05 | W-K-M Wellhead Systems, Inc. | Pressure responsive safety system for fluid lines |
Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4546787A (en) * | 1981-06-22 | 1985-10-15 | Clark Rubber Limited | Hydraulic valve control device |
US4617970A (en) * | 1985-04-11 | 1986-10-21 | Institute Po Mebeli I Obzavejdane | Fluidic sensor of objects |
US4580599A (en) * | 1985-07-25 | 1986-04-08 | The Dow Chemical Company | Valve assembly for relieving pressure on a process structure |
US4777383A (en) * | 1987-06-01 | 1988-10-11 | Ldi Pneutronics Corp. | Electrically controlled variable pressure pneumatic circuit |
US4967793A (en) * | 1988-03-14 | 1990-11-06 | Gill Ajit S | Compact multi-stage pressure reducing valve |
WO1990012974A1 (en) * | 1989-04-19 | 1990-11-01 | Ajit Singh Gill | Compact multi-stage pressure reducing valve |
US5060691A (en) * | 1989-04-19 | 1991-10-29 | Gill Ajit S | Compact multi-stage pressure reducing valve |
US4978947A (en) * | 1989-05-25 | 1990-12-18 | Bs&B Safety Systems, Inc. | Rupturable fluid flow indicator |
WO1991016562A1 (en) * | 1990-04-19 | 1991-10-31 | Ajit Singh Gill | Compact multi-stage pressure reducing valve |
US5583490A (en) * | 1994-07-15 | 1996-12-10 | Htv Industries, Inc. | Rupture disk monitoring apparatus |
US5774372A (en) * | 1996-03-29 | 1998-06-30 | Berwanger; Pat | Pressure protection manager system & apparatus |
WO1999056047A3 (en) * | 1998-04-24 | 2000-02-10 | Anderson Greenwood Lp | Pressure relief valve monitoring device |
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